Noninvasive measurement of optic nervehead mechanical compliance in normal and ocular hypertensive beagles

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Abstract
The susceptibility of some eyes to glaucomatous damage is due to an abnormal weakness of the structural support of the optic neverhead. To verify this hypothesis and, if it proves correct, to provide an early test of glaucoma, a noninvasive method of measuring the optic nervehead compliance was developed. The first in vivo measurements that were performed in a normal beagle dog and dogs with congenitally elevated intraocular pressure (IOP) over different periods of time were presented. The quality of the measurements was tested and the reproducibility of the optic nervehead displacement was .+-.15 .mu.m. The optic nervehead displacement was found to be higher in the older dogs that also sustained ocular hypertension for a longer period. These results were compared with ophthalmoscopic observations of the optic disc. The method may be applicable to the measurement of the optic nervehead compliance, and the structural support of the optic nervehead may vary.

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